Automatic shutoff valve



I gg 39 INVENTOR. a4/V 2 Sheets-Sheet 1 i BY IJ,

D. SAMIRAN AUTOMATIC SHUTOFF VALVE Filed Aug. 6. 1941 mmm. m

mur-wl will Ju1y11, 1944.

July11, 1944.

D. sAMlRAN 2,353,191

AUTOMATIC SHUTOFF VALVE Filed Aug. 6. 1941 2 Sheets-Sheet 2 041//0 24N By AT TURA/'EMS' Patented July ll, 1944 AUTOMATIC snu'ronf vALva 'Davidsalniraia Fairfield. Ohio Application annuals, sci-iu No. 405,615 lz Claim. (ci. .lsv-153) (Granted under the -aot of March 3,

amended April 3l, 1928; 370 0. G. 757) 'lhe invention described herein may be manufactured and used byor for Government or gov-v emmental purposes. without the vpayment to me of any royalty thereon.

My present invention relates ,to an automatic shut-olf valve which will shut H the flow of uid to an indicating device. a pressure 'control device or a pressure operated device, or 'the like. when the fluid containing system on the outlet side of the valve is ruptured at any point..

One object ofthe invention is toprovide 'ayshut-oif valve o! the general character menioned which is entirely automatic in operation in that it permits normal fluid iiow and normal surges in the iluid line, but when a rupture takes place, thereby causing excess uid flow, the valvev closes against leakage of the fluid under pressure at the rupture.

My automatic shut-olf valve is particularly useful in connection with aircraft engines, where the rupture of a fuel line presents a fire hazard. For instance, pressure indicating devices or pressure operated devices may be located in the cockpit of the plane and oil or fuel lines may extend thereto from ythe oil pump, fuel pump, carburetor or other part of the engine, for the purpose of indicating pressure of such part or for operating an automatic control dependent upon changes in such pressure.

It is therefore a further object of my invention to pro'vide an automatic shut-off valve structure which may be interposed between such an indicating or control device and the part of the engine supplying iluid pressure thereto, so that upon failure of the indicating or control'device or any part of the fluid line leading thereto, the fuel or other fluid being supplied through the shut-off valve to the indicating or control device will be shut oi! at the valve, thus eliminating the possibility of spraying the liquid into the cockpit of the engine compartment or on any part of the plane where it might catch ilre.

Still a further object is to provide an automatic shut-off valve structure wherein the valve is normally open as long as normal fluid flow or pressure surges in the fluid system occur, but upon excess fluid ilow, as would happen in the case of a rupture, the valve will automatically respond to the increased fluid ow and shut off in such manner that it must be reset before it can be put into operation again. Still a further object is to provide amodled form of my invention wherein a shut-oi! element of the valve is so shaped and arranged as tomaintwo parts then screwed together, `provided to `lock them in assembled l0 v.in the .-valve structure so constructed and ararrangement in the'valve showing it connected in tain a balance on the opposite sides of the shutedout in my claims and 1883,l as

on element during normal nuid now. the smit--` `.on element moving automaticallv` to its shut-off position upon an unbalanced condition occurring as a result of line rupture or the like.

Another' object is to provide a modined form of simplifiedv construction having a two-part body in which various inserts are assembled and the position. Another object isA to provide a shut-oil' element ranged as to permit resetting thereof by the introduction of fluid pressure to theoutlet side of the shut-olf valve, after which the valve may be connected for further service. 1

Still another object is to provide a baille plate body to take care of fuel pressure gauge systems and the like wherein a liquid lill other than the fuel is used to charge the liquid system between the shut-oil' valve and the indicating or control device, a check valve being associated therewith for preventing the liquid illl from entering the shut-oil. valve when the lill is of greater specific gravity than the fuel and the valve is in inverted position, a restricted Opening being provided through the check valve to permit pressure equalization'on opposite sides thereof in the event that the fill expands under high temperature conditions.

Still another object is to provide a plug in the valve body to permit introduction' of the liquid fill at thetime ofinstallation-of thev valve.

With these and other objects in view, my intained, asfhereinafter more fully set forth, pointcompanying drawings, wherein:

Figure 1 is a side elevation of my shut-off valve a fuel system including a fuel pump, a carburetor and a fuel gauge;

Figure l* illustrates diagrammatically a preserate equally as well;

Figure 2 is an enlarged sectional view through the shut-on valve per se, showing it by solid lines in normal position and by dotted lines in a position intermediate normal and shut-oil. positions;

Figure 3 is a further enlarged sectional view of a .portion of Figure 2 showing the valve in shut-olf position, and by dotted lines the shape that the shut-oil' element assumes as a result means being illustrated in the acof reverse fluid pressure flow through the valve for resetting purposes;

Figure 4 is an end elevation of another form of my shut-off valve;

Figure 5 is an enlarged sectional view on the line 5-5 of Figure 4;

Figure 6 is a side elevation of two of my shutoir valves showing them connected in a. fuel system so as to guard against fuel leakage either by a rupture in the' line to the carburetor or by a rupture in the line to a fuel gauge;

Figure '7 is a full-size side View of a modified form of the invention;

Figure 8 is an enlarged longitudinal sectional View of the form of my shut-off valve shown in Figure 7 showing the parts in normal operating position; and

Figure 9 is a similar sectional view of a portion of Figure 8 showing the shut-off element in its shut-off position.

On the accompanying drawings, I have shown my automatic shut-off valve connected in Figure 1 with a fuel pump I0 and a carburetor I2. A fuel line I3 extends from the outlet of the pump I to the inlet of the carburetor I2. A pipe T I4 is inserted in the line at I4. A fuel pressure gauge I is illustrated, having a conduit I6 leading thereto. Ordinarily, the conduit I6 is connected with the T I4 so that the pressure of fuel from the pump to the carburetor may be indicated. My shut-ofl valve is indicated generally at V and, it will be noted, is interposed between the T I4 and the conduit I6 for the purpose of shutting off the flow of fuel from the pump I0 through any rupture in the conduit I6 or the gauge I5, as will be hereinafter described.

In Figure 1a, I show the conduit I6 connected with a control device or pressure operated bellows I1 instead of the pressure gauge I5, as my shut-ofi valve is adapted for devices of this character as well as for any device receiving liquid under pressure where there is the desirability of shutting off the liquid if a rupture occurs. The bellows I6, by way of illustration, is shown as operating a control in the form of a switch arm I8 for closing a circuit through a contact I9.

My shut-oir valve V, as shown in Figures 2 and 3, comprises a central body portion 20 having end anges 2i and 22 for connection with the T I4 and the conduit I6, respectively. Through the body a bore, having portions 23, 24, 25 and 26, extends. The portion 23 receives a sleeve S, while the portion 24 is a restriction to provide a valve seat at 21. The portion 26 is threaded to receive an adjusting nut 28 for a. spring 21. The spring 21 is interposed between the nut 28 and a socket member 29 having a plurality of spokes 30 forming a guide for movement of the socket element 29 in the bore 25.

Received in the socket element 29 is a valve stem 3'I. A cone-shaped shut-off element 32 is molded on the stem 3i, the element 32 being made of rubber, DuPrene, or the like.

The shut-off element 32 has an outwardly flared flange 33 atits periphery or open end adapted to normally enter an enlargement 34 of a bore 35 of the sleeve S, as shown by solid lines in Figure 2. When in the enlarged portion 34, liquid entering the flange fitting 2| passes through a space 36 around the sleeve S and through by-pass ports 31, thereby by-passing the enlarged bore portion 34 wherein the outwardly iiared flange 33 is seated. This flange is seated under pressure by the of the cone-shaped shut-off element 32 through fluid entering the interior openings 38 formed in a disc element 33. The element 39 has spokes 46 to support it in the bore portion 23 and a pinlike extension 4I to serve as a stop for the cone-shaped element 32 by engaging the inner surface thereof in the normal position of the shut-of! element, as shown by solid lines in Figure 2. The disc element 39 is retained in position by a spring 42 interposed between the spokes 40 and the flange fitting 2 I The bore 35 of the sleeve S is also provided with a pair of ratchetlike teeth 43 adapted at times to receive the flared flange 33, as will be hereinafter described. The fluid that by-passes through the ports 31 flows through the valve seat 21, between the spokes 30 and through an opening 44 in the adjusting nut 23.

In Figures 4 and 5, I have shown a modified construction wherein access may be had to an adjusting'nut 28 by removing a plug 45. The valve body 20 is somewhat modified so as to have an outlet fitting 22 secured thereto as by screws 46, with a. gasket 41 interposed between the body and the fitting. The tting 22 has therein a plurality of baille plates 43 providing baille spaces at 49. The baffle plates have vstag- .gered openings 50 and the upper plate leprovided with projections 5I to support a check valve disc 52. The disc 52 has a small opening 53 therethrough for equalization of the pressure, as will be hereinafter described. A filler plug 54 is provided for use in charging the fluid sys! tem from the fitting 22* through the conduit I6 to the gauge or control device I5 or I1, with a suitable fluid such as Prestone, or the like, which is immiscible with relation to a fluid such as fuel.

The parts of the valve shown in Figure 5 which are not thus far described are similar to those already described in. connection with Figures 2 and 3, and bear the same reference numerals with the addition of the character a.

In the modification shown in Figures '1, 8 and 9, a two-part body is provided, one part bearing reference numeral 55 and the other part 56. The part 55 has an inlet opening 2lb and the part 55 has an outlet opening 221. The part 56 is screwed into the part 55 with a lock washer 51 between them. The lock washer is initially flat, and after assembly may be bent at points indicated as 53 into notches 59 of the body parts 55 and 55 to thereby lock the body parts against subsequent unscrewing relative to each other.

yWithin the valve V, illustrated in Figure 8, there are a number of inserts, some of which are similar to or, at least, have parts similar to those already describedin connection with Figure 2. Such parts bear the same reference numerals, with the addition of b. Other parts and portions thereof which are different will now be described.

A tubular insert is provided having a small cylindrical portion 60 and an enlarged cylindrical portion 6 I. These portions are connected together by a constricted part terminating in a valve seat 62. The shut-off element 32b is adapted to seat against the seat 62 at times, as shown in Figure 9. The insert 60--6I is sealed Within the body of the valve by a gasket 63.

The shut-off element 32", besides having the cone-shaped part 33h, has a second cone-shaped part 64. 'I'he parts 33" and 64 are normally located between the by-pass ports 31 and 31" and. against the stop member 4Ib which, in this case, is in the form of a bar bent to a V-shape and e than would a Bourdon type otv gauge, which takesretained in position br in twooi the i'our equally spaced slotsl Il@ across the right-handy endl o! ends of the stop position The valve shown seat at il with which v im. Slightly arched springleat Il isssecured-io the disk by a tubular rivet which forms a restricted or cap which arezllt' the .cylinder Il (see Pig. 9). The body portion-ll engages theV bm uw retain itin m, mi we L a disk valve ewiges-NA" ya rupture. I The valve may even befused on. t uid gconsumng devices .by enlarging the pasthespring restingin l'l. deeper sume the solici line positionshownin Figure 2.

necessary flow oitV nuid take care of any possible surges inthe iiuid system the valve V without operating the valve would require by-pass but an iniinitely small now of fluid i.' its operation. In the event of thgfailure o the gauge or control device, or rupture of the conduit I6, then the fluid under pressure Aentering ange fitting 2| would tend shaped shut-oi! element 32 closed position withv respect to the valve s eat 21'.

For instance, the dotted position of Figure2 illustrates the shut-ofi element beingv so propelled, l

with the ared flange 32 disengaged frmthe bore enlargement 34 by the pressure lof the flowing uid inside thecone-shapedelement, vand effecting a contraction vof the flared ange. 33 so that it may travel inside the bore 35. Normally, the shut-oi! element will seat against theiseat 21', as shown by solid lines in Figure 3, andv the flared flange 33 will expand into one o1' the ratchetlike teeth or annular grooves. Just before en tering the teeth, the 'flared'iiange will have passed the ports 31 to close them oi and permit the full force of the iiuid under-pressure entering-the flange fitting 2l to effect the iinal closing oi the shut-ofi element against the valve seat with snap action, and at the same :time insuring expansion of the ared ange 33 into thegroove 43.

The shut-ofi valve is now in its shut-ofi` position, so that the uid under pressurev can no longer flow through the valve V and be discharged through the rupture-which caused the valve to v operate. Thus, the possibility of fuel, for instance, being discharged into the cockpit of an airplane or into the engine compartment, which represents a iire hazard, is eliminated in the event that the conduit i6 is ruptured lthrough any cause, such asby a penetration of a bullet.

The shut-oli' valve is now in such position that it cannot be used again without resetting. Resetting is accomplished by disconnecting the conduit Ii and introducing iluid under pressure, such as compressed air, to the fitting 22. This causes to the bellows Hor to n the pressure gaugell, as the case may be.' and to v.

to flowoutthrough such rupture. 'Ihe passageways 21 .are of sufilcientlypressure is builtup through the openings 38 and insidetheconef to vpropel ittoward slots Il arecutintermedia uie- A f four-shallow tsl'leintheends'oithecym Normally, me or. mythic-oir 'valve-inthe shut-oit element to v ltion-'shown by solid lines in Figure 2.

` I2 will move to its shut-oi! position vsure desired,which of course into the valve bodygZl,

spring 21 win meneame movel to its initial Dosicompressedair and the The spring. 21 is ser so that the shut-'oir element at any presexcessi've iluid :flow through the valve as caused fin-excess oi' the capacity ofthe fluid consuming device, the shutol! valvev will not operate, but

when a rupture-occurs between .the valve and the fluid consuming device the increased flow of uid :operates the valv jWith. the form-,of invention shown in Figures 4,1 and-5, -it is possible tol hook upa gauge or the likefvv'itli fitting lzlnxremove the screw I4 and ting 22, including.

' suitable-uuid, such as-Pr'estone or the like. 'Ihe charge the gauge li, the conduit-'Naud the ntthevbaiile spaces 49, with a screw. 54 may then be relnserted with assurance that the Prestone, serving as a ll, will not pass irst because of the restricted spaces 48 between -the baille plates Il, coupled with the tortuous path for the iill provided` by the staggered plates, and second because the check'valve I2 .wouldfnormally seat against a seat indicated at '55. When fuelv pressure enters the valve body 2,0, it. will open the check valve $2 to ,permit ready transmission of its pressure through the ll inthe fitting 22l to the gauge I ibut-,prevent l ready reverse iiow. To take care of expansion i caused by heat ambient vto the gauge Il and/or v the small openingil except as caused by expansion from heat, is applied to the conclult I6, thesmall to relievev any such pressure back into the fitting 20.- The check valve 52 serves'as a means to pre- .valve body 20"v when thevalve opening 53 is provided vent gravity .iiow oi' the Prestone fillinto the is in inverted position, as the fill f will not readily iiow through when pressure, such a 'the nu.

' connection with reverse ow through the valve. which will eiIect contraction of the cone-shaped shut-oil element My automatic shutofr valve', it will be obviousV fromthe foregoingspeclilcation, is automatic in that it shuts ofi' the flow of a iiuid under pressure through a rupture in the uid containing system. Where the uid flammable material, the The valve is also useful serving valuable fluids point to another, where ture in the fluid line.

By way of example, in Figure 6 I show two of the valves-V instead of one, as in Figure 1. 'I'he second valve is mounted between the fuel pump III 'and the carburetor ture in the line I3 the valve adjacent thepump lil will shut voil?. v'This valve, of course, would have its by-pass ports 3l of the proper size tov permit maximum fuel now to the carburetor I2,

Vbut shut oil whenever there is excessive ilow as caused by .rupture in the line to the carburetor.

My 'shut-ofi valve is also adaptable for use in acids or other chemicals being pumped from one point to another which might cause damage if discharged from a ruptured line.

In the operation of the modiied fonn of nw invention illustrated in Figures 7, 8 and 9, the portions 33" and 64 ofthe shut-oir element 32h form vopposed pressure faces between which a pressure balance is normally maintained. Fuel at the normal A.rate ilows from the inlet 2|b correspondstoan openings 'lll of thebame under pressure is an inthere is danger of rup- 'Y I2 so that if there is a rupthrough the restricted opening 68 but does not open the valve disk 66 in so doing. The fuel then flows through the slots 69 of the cylinder 6I, enters the passageways 36D, by way of port 31Hb and then flows through the by-pass ports 31h, the valve seat 62 and the cylinder 60, to the outlet 22h. The fuel pressure is balanced on opposite sides of a partition wall of the shut-off element 32" so that the spring 21b keeps the shut-off element against the stop bar Mb. Excessive fuel flow, however, reduces the pressure within the cone-shaped part 64 of the shut-off element, which, of course, is possible due to the restricted character of the by-pass ports 31h. Predominating pressure in the inlet 2 Ib therefore enters into play to move the valve 66 off its seat and permit greater ow through the four slots 69 and against the surface 33b than may readily pass through the openings 31a, and thus moves the shut-off element 32b toward the left against the bias of the spring 21h. The first action that occurs is cut off of the fuel at the ports 3lb by the cone-shaped part 64, whereupon the full flow pressure acting in the cone-shaped part 33b snaps the shut-off element to the closed position of Figure 9. In this position the shut-off element wedges into the valve seat 62, as illustrated, and I have found that this wedging action is sufcient in certain installations without the necessity of utilizing the ratchet teeth 43 of Figure 2.

One of the principal advantages of the form of construction shown in Figure 8 over that shown7 in Figure 2 is that by locating the valve member 66 as in Figure 8, excessive drainage from the valve is prevented when the airplane engine, and consequently the fuel pump, are not operating. With the parts as shown in Figure 2, there is a tendency, when the airplane engine and fuel pump are not operating, for fluid to drain from the valve into the pipe 2l and air to flow into the space vacated by the fluid. Upon again starting the engines, if a substantial quantity of air has passed into the space to the left of the valve and this air is compressed by fluid pressure from the right, the effect is the same as if the line to the left of the valve were open, resulting in an unwanted movement of the valve which may amount to a closing movement. Placing valve`66 to the 'fright of the valve assembly as shown in Figure 8 avoids any possibility of such a condition of operation arising. With the parts as in Figure 8, when the engines and the fuel pump cease to operate, any tendency of fluid to ow from the valve assembly is prevented by a consequent closing of valve 66--the orifice 68"L in member '68, like a small opening in a bottle, preventing the movement of any substantial amount of liquid therethrough. Owing to the fact that the amount of l air which passed through the orifice 68 in memyber 66. is negligible, the valve will function normally when the engines and fuel pump again op- Ierate. The arrangement of parts as shown in Figure 8 also has a damping eiect on the indicator gauge, since any surging tendency in the line will be accompanied by a closing of valve 66 when the movement of fluid is toward the right.

To reset the shut-off valve of Figure 8 for subsequent automatic operation the valve is disconnected, as already described in connection with Figure 2, and compressed air introduced through it in a reverse direction.

'I'he valve 66 prevents drainage of fluid from the shut-off valve V and eliminates the possibility of an undesired movement of the valve to closing position, as might be the case if air were trapped in the valve when it was put back into service. The valve 66 closes when compressed air is introduced in a reverse direction through the valve and prevents the fuel or other fluid in the valve from draining out.

The valve in operation automatically closes in such manner that it is locked in the closed position and can be reset only by a specific operation, such as introducing compressed air of sufficient pressure in a reverse direction through the valve to contract the shut-off element 32 and move it to its initial position.

Some changes may.be made in the construction and arrangement of the parts of my device Without departing from the real spirit and purpose of my invention, and it is my intention therefore to cover by my appended claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope without sacrificing any of the advantages thereof.

I claim as my invention:

1. In an automatic shut-off valve of the character disclosed, a valve body having a bore therethrough, opposite ends of said bore constituting an inlet and an outlet for the valve, a substantially cone-shaped shut-off element in said bore provided with an open base end, said bore having a valve seat, means normally spacing said shutoff element from said seat with said open end of the element facing said inlet, said bore having an enlarged portion toj receive the periphery of said shut-off element and to normally retain said shut-off element against closing on said seat, said periphery engaging said enlarged portion to prevent floW past the periphery, by-pass ports to permit normal iiuid fiow past said periphery of said shut-off element, said shut-off element being incapable of resisting excess fluid ilow whereby such excess fluid iiow moves said shut-off element to seat against said valve seat, means to retain said shut-off element in position against said valve seat upon its assumption of such position, said last means comprising a groove in said bore on the outlet side of said ports adapted to receive the periphery of said shut-off element, said periphery of said shut-off element being contractible from its position in said groove and the shut-off element being returnable to normal position by introduction of fluid pressure to the outlet side of said valve for resetting purposes, and a baille plate arrangement in said valve body on the outlet side of said valve seat.

2. In a valve structure of the character disclosed, a valve body, a baffle plate arrangement in said valve body on the outlet side thereof, a. removable plug in said valve body on the outlet side of said baffle plate arrangement to permit the introduction of a liquid fill into the valve body on the outlet side thereof, and a check valve between said baffle plate arrangement and the interior of said valve body, opening away from said interior and having a restricted orifice for liquid pressure equalization through said check valve.

3. An automatic shut-off valve comprising a valve body having a bore for the flow of fluid under pressure therethrough, a valve seat in said bore, a shut-off element in said bore and having its periphery engaging the bore to prevent ow between said periphery and said bore, said valve body having ports adjacent the periphery of and by-passing said shut-01T element to permit balancing of fluid pressure on opposite sides thereof escalar and to permit normal now of i'iuidthrough valve body by wayv of saidv the portameans biasing said shut-oil element to its normal position,l

ports permitting flow offluid during normal operation thereof and introducing through saidvalve resistance to such now of iluid whenv excessive through said shut-oi! valve to thereby cause ltime uid under pressurev entering said valve body to predominate on one side of said shut-ol element.-

and move it untilits periphery moves past said ports and thereby' shuts oi'i!` the iiow of duid' through said valve. lsaid shut-oi! element. therey upon being sublectedto the m11 amant-mure to move quickly to its closed position, having a normally seated check valve at vits inlet side and opening irom the inlet towardithe interior of the body, said check capillary opening therethrough. v

4. An automatic shut-oil valve comprising 'a valve body having a bore for the ilow of Huid4 said valve body I fis valve having a- *l under pressure therethrough; a valve seat in said' bore, a tapered shut-off element in said bore havv haped parts and the wall of saidV ing oppositely opening cone-s having its periphery engaging bore to normally prevent now' thru said bore around said periphery, said valve Abody Ihaving ports by-passing said parts to permit balancing of fluid pressure on opposite sides-of said shut-oi! element, said by-pass ports being located between the inlet to said bore and said valve body, means biasing said shut-oli element to its normal position, said ports permitting ilow of iluid through bore past the periphery-of said shut-ot! element.

spring means biasing" said l shut-oi! l element to such-normal position in which said portion that coasts with 'the` seat-11s' spaced l from .said seat, ports ,by-passing said shut-oil element to permit a normal iiowj of iluid.v through said valve, said ports being of small vcapacity 'to' introduce substantial' resistance to the now oi' iluid upon an abnormaldrop in the ,oi' said shut-off-valve thereby cause the uid y under pressure "entering said `valve body to move y said shut-oil: elementuntil itsy tlaredilange passes said ports and coacts with said enlarged part or said boretto therebyshut off the flow of fluid through saidV valve by `way of said by-pass ports when the portion which coacts with said seat is seated, and ratchetlike teeth receiving said ared ilange'o'f said'shu't-oil' element and thereby presaid valvev during normal operation thereof land,

introducingresistance to such ilowoi' fluid when it becomes excessive through said shut-on valve to thereby cause the iluid under pressure entering vventing return movement of said shut-off element to its normal position-by the bias of said spring.

'sai'.i'shut-oi'element being compressible by the .introduction of fluid under pressure to said outlet end of said bore to retract' said flared flange from said valve body to predominate on one side of l a said shut-off element and move it until its periphery passes said ports and thereby shuts od vthe ilow of uid through said valve, said shut-oi! element thereupon being subjected to the full iluid pressure to move quickly to its seated position with respect to said valve seat and being compressible by the introduction of fluid pressure in a reverse direction through said bore to unwedge the shut-ofi element from said valve seat and permit movement thereof to its initial position.

5. In an automatic shut-oil valve structure, a valve body having a bore therethrough, afvalve seat in said bore, a shut-oil element, resilient means urging said shut-ofi element to non-shutsaid ratchetlike teeth and' permit movement of saidshut-oflelernent to its normal position for .resetting `purposfes... j y Y 7, An automatic shut-oilvalve for a now line leading to a pressure operated deviceor `the like which is arranged to close when. excess flow occurs -between its inlet and its outlet resulting from failure of said ilow line or pressure operated device or the like, comprising a valve body having a bore therethrough, one end of said bore constituting an inlet for iluid under pressure and the other end thereof constituting anv outlet, a

' valveseat in said bore facing the inlet end thereoi! position with respect to said valve seat said shut-oil' element being constructed and arranged that when so positioned it prevents fluid ilow between itself and the bore, by-pass ports `around said shut-oil. element and located between lthe normal fluid flow, said ports resisting excess" fluid ilow through said valve, said shut-on element thereupon being seated with relation to said valve .inlet of the bore and said-valve seat to permit seat by the Aow of such excess uid, and a norv mally seated check valve o y located at the inlet end of said valve body, said check valve having an opening therethrough large enough to permit only normal fluid now.

Dening inwardly and 6. An automatic shut-oi! valve for a ow.. line l leading to a pressure operated device-or the like. which is arranged to close when excess ilow occurs between its inlet and its outlet resulting from.

failure of said now line or pressure operated device or the like, comprising -a valve body having'- a bore therethrough, one end of said bore vcon-- stituting an inlet lfor, said uid under'pressure and the other end thereof constituting :tn-outlet,

of,'a substantially cone-shaped resilient 'shut-oi! element in said borehaving a portion for coaction with said seat and having its base end open and rfacing said inlet, said open end'having an outwardly nared flange, said bore having an enlargedl part in which said ilared ilange is normally'positioned, said ilared ange coacting with the wall of said enlarged part of said bore to close oil! theilow of uid. throughsaid Vbore past the peripheryv of said shut-oi! element, the coacting portionv being spaced @from thevalvve seat when the vshut-oil?` elementfis' '1n vitsfnormal position, means by-pas'sing said shut-,ofi elementtopermit a normal ilow of iiuid through said. valve, said `bypass means being offjsmall capacity tol introduce substantial Vresistance tothe Vilow of iluid upon an abnormal -drop in the pressure on the outlet side of said shut-oil valve and thereby cause the 4iluid under pressure entering said 'valve body to. move said shut-ofi element until its ilared flange leading to a pressure operateddevice or the like v e valveseat in majbore ming the :niet

pressure on the outlet side' which is arranged to close when excess flow occurs between its inlet and its outlet'resulting from failure of said flow line or pressure operated device or the like, comprising a valve body having a bore for flow of fluid under pressure therethrough. a valve scat in said bore, a substantially cone-shaped shut-off element in said bore having a portion for coaction with said scat and having its base open and facing the source of fluid under pressure. said bore having an enlarged part in which the periphery of said shut-off element is normally positioned, said periphery of said shutoff element coacting with the wall of said enlarged part of said bore to close off the flow of fluid through said bore past the periphery of said shut-off element, means biasing said shut-off element to such normal position in which said portion that coacts with the seat is spaced from said seat, ports by-passing said shut-off element to permit a normal flow of fluid through said valve. said ports introducing substantial resistance to the flow of fluid upon an abnormal drop in the pressure on the outlet side of said shut-oil valve and thereby causing the fluid under pressure entering said valve body off element until its periphery passes said ports and coacts with said enlarged part of said bore and thereby subjects said shut-oil element to the full fluid pressure to positively shut off the flow of fluid to said valve by way of said by-pass means when said coacting portion seats on said seat.

9. An automatic shut-olf valve comprising a valve body having a bore therethrough provided with a valve seat, a cone-shaped resilient element having its periphery engaging the wall of said 1 bore, means to normally position said cone-shaped resilient element to unseat it from said seat, said resilient element being so constructed and arranged that when so positioned its periphery engages the walls of said bore and prevents flow through said bore around its periphery, by-pass ports around said cone-shaped element in its normal position and located between the inlet to said bore and said valve seat, said ports being of restricted capacity to introduce substantial resistance to the flow of fluid when excessive flow through the valve occurs, said fluid pressure thereupon moving said cone-shaped element to seated position with respect to said valve seat and effecting a wedging of said cone-shaped element in said valve seat due to the resiliency of the element to thereby lock it against return movement to normal position.

l0. In an automatic shut-off valve, a valve body having a bore provided with a valve seat, a shutofi element having its periphery engaging the wall of said bore and normally spaced from said seat but shutting off the flow to said bore around the periphery to said element, said valve seat being between said shut-off element and the outlet of the valve, by-pass ports around said shut-oil element in its normal position and located between the inlet and-said valve seat, said ports being of a capacity which introduces substantial resistance to the llow of fluid when excessive flow to move said shut- `bypass ports, said through the valve occurs, said fluid pressure in said inlet side thereupon moving -said shut-ofi element to a seating position on said valve seat for shutting ofi the flow of fluid through said fluid pressure acting fully upon said shut-off element during the final closing thereof to seat it with snap action after said by-pass ports are closed by the shut-off element moving from its normal position.

11. An automatic shut-of! valve structure comprising a valve body having an inlet and an outlet, a bore connecting said inlet and outlet, a valve seat in said bore, a cone-shaped shut-oi! element having its periphery engaging the wall of said bore to prevent flow through said bore around the periphery of said element, a stop pin for said element, resilient means urging said element to a normal position engaging said stop pin and spaced from said seat, said bore having an enlarged portion receiving the periphery of said shut-off element in such position, by-pass ports around said periphery of said shut-off element, and located between the inlet to said bore and said valve scat to permit normal fluid flow, said ports resisting excess fluid flow when occuring thru said valve and thereby causing the uid pressure to propel the cone-shaped shut-off element to seated position with relation to said valve seat, said bore having an annular groove between said ports and said valve seat to receive the periphery of said shut-off element and thereby retain it against return movement to its normal position, said shut-olf element being distortable by the introduction of fluid pressure from the outlet side of said valve to remove its periphery from said annular groove and to effect such return, baille means in said valve body between said seat and said outlet, and a check valve between said baffle means and said valve seat.

l2. In an automatic shut-01T valve structure, a valve body having a bore therethrough, a valve seat in said bore, a shut-off element having its periphery engaging the wall of said bore and normally preventing flow through said bore around said periphery, resilient means urging said element to non shut-off initial position with respect to said seat, by-pass ports around said shut-off element and located between the inlet to said bore and said valve seat to permit normal fluid flow, said ports resisting excess fluid flow when occuring through said valve, said element thereupon being seated with relation to said valve seat by the flow of such excess fluid, said bore having an annular groove between said ports and said valve seat to receive the periphery of said shut-off element and thereby retain it against return movement to its initial position, said shut-off element being distortable by the introduction of fluid pressure from the outlet side of said valve to contract said periphery thereof from engagement in said annular groove to thereby effect such return of said shut-off element to initial position for resetting purposes.

DAVID SAMIRAN. 

